I was driving with my sister when I was still in high school. It was around 8 I'm guessing, but either way the sun was setting to our right, and in front of us, above the treeline, it looked like a glowing blue orb thing in the sky about a mile away. I pointed it to my sister and she wondered what it was also. We kept driving and the treeline hid the object, when I came to the top of another small hill and saw it again, very clearly, but then the treeline hid it again and then I didn't see it again. It looked pretty big, maybe 60-100ft at what looked like a mile away. It was pretty low in the sky, and was a kind of luminous light blue color, and it seemed a little darker around the edges.